Answer :

According to Henry's law,


"At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid."


Stated as,


p = KHx


Where,


P = partial pressure of the solute above the solution


KH = Henry's constant


x = concentration of the solute in the solution


Given,


Solubility of H2S in water at STP is 0.195 m


We know,


At STP pressure p = 0.987 bar.


0.195 mol of H2S is dissolved in 1000g of water


Moles of water =


= 55.56 g/mol


the mole fraction of H2S =


=


= 0.0035


According to Henry's law,


p = KHx


KH =


KH =


KH = 282 bar


The Henry’s law constant is 282 bar


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